Gearing.



J. WOLFF.

GEARING.

APPLICATION FILED MAY 20. 1916.

1,282, 34:9. 1 Patented Oct. 22, 1918.

Attorneys.

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JOSEPH WOLFE, OF BROOKLYN, NEW YORK, ASSIGN OR TO SON ORA PHONOGRAPHCORPORATION, A CORPORATION OF NEW vYORK.

G'EARING.

To all wit-omit may concern:

Be it known that I, JosErH Wonrr, a sub ject of the King of GreatBritain and he land, and a resident of the borough of Brooklyn, in thecounty of Kings, State of New York, have invented a certain new anduseful Improvement in Gearing, of which the following is aspecification.

- My invention relates to gearing, and more particularly to the windinggear of spring motors, such as are commonly employed in talkingmachines, and my object is to produce a form of tooth gearing which willbe noiseless in operation.

This and further objects will more fully appear in the followingspecification and accompanying drawings, considered together orseparately.

I have illustrated one embodiment of my invention in the accompanyingdrawings, in which like parts in all the different figures aredesignated by similar reference characters, and in which,

Figure 1 is an end view of a spring motor provided with my invention,and with parts broken away;

Fig. 2 is a bottom plan view of the same, with parts broken away;

Figs. 3 and 4 are diagrammatic views showing the operation of the gears;and

Fig. 5 is a diagrammatic view of a modification.

In all the drawings, 1 designates the base plate by means of which themotor is secured in its cabinet, and 2 is a bottom plate supported byand spaced apart from the base plate.

Mounted between the base and bottom plates is a divided spring drum 3,one section of which is provided with a spur gear 4, which meshes with apinion 5 on a counter-shaft 6. The counter-shaft carries a spur gear 7which meshes with a pinion 8 on a turn-table shaft 9, which projectsthrough the base plate and is adapted to receive and support a suitableturn-table (not shown). The shaft 9 has geared thereto a governingdevice 10, by means of which the rate of unwinding of the spring 11 inthe drum 3 is regulated.

At the end of the spring drum section, opposite the gear 1 is a circularrack 12 secured to the drum. This rack encircles the drum, and consistsof radial teeth 13 having parallel sides.

Specification of Letters Patent.

rammed 0a. 22, 1918.

' Application filed. May 20, 1916. Serial No. 98,835.

The teeth 13 are narrow relatively to the pitch, so that the spacebetween the teeth is considerably greater than the width of the teeth. 7

The spring 11 is anchored t the inside of the upper half of the drum,and to'the drum shaft 1a attached to the lower half of the drum and inunwinding tends to rotate the rack 12 in the direction of the arrow a,and the gear 4 in the direction of the arrow 0.

A winding shaft 15 is journaled in the motor frame, and is disposed atright angles to the shaft 14. One end of the winding shaft projectsoutward and through the wall of the cabinet, and is provided with meansfor the attachment of a crank (not shown) and at its inner end with apinion 16, the teeth of which engage the rack 12. The sides of the teethof the Pinion 16 are well rounded outside of the pitch line. The shapeof the teeth inside the pitch line is immaterial, and in fact this partof the teeth may be omitted, as shown in Fig. 5, where the roots of theteeth are on the pitch line.

The winding shaft is provided with a pawl and ratchet by means of whichbackward movement is prevented.

The operation of my improved gearing is as follows:

The winding shaft is turned in the clockwise direction and through thepinion 16 and rack 12 the spring 11 is wound. The tendency of the springto unwind will always exert pressure in the direction of the arrow a andhold the engaging teeth of the rack against the left side of the teethof the pinion. The teeth are so proportioned and disposed that beforeone tooth of the pinion leaves a tooth of the rack, a second piniontootlrwill engage a second rack tooth. The curvature of the pinion teethis such that they will contact with the rack teeth gradually andsilently. The fact that the teeth engage at one side only greatlyeliminates friction and reduces noise.

The rear Or non-engaging sides of the pinion may be made of any shape asthey have no work to perform, and the same is true of the non-engagingsides of the rack teeth.

If desired, the teeth may be reversed that is the rounded teeth may becarried on the drum and the straight sided teeth on the pinion.

In accordance with the provisions of the patent statute, I havedescribed the principle of my invention together with the apparatuswhich I now consider to represent the best embodiment thereof, but Idesire to have it understood that the apparatus shown is merelyillustrative and that the invention can be carried out in other ways.

Having now described my invention, what I claim and desire to secure byLetters Patent is:

A'winding gearing for talking machine motors, comprising a circular rackand a pinion, the axis of the pinion being perpendicular to the axis ofthe rack, means for rotating the pinion, a pawl and ratchet mechanismfor preventing rotation of the pinion in one direction, a spring soarranged relatively to the rack that it will be placed Copies of thispatent may be obtained for five cents each, by addressing the undertension by the movement of the pinion, theunwinding of the springtending to hold the rack and pinion against the pawl and ratchetmechanism, whereby one side only of the teeth of the pinion and rackwill engage, the engaging faces f the rack teeth being straight and theengaging faces of the pinion teeth being convex, the spring being soarranged that it will be wound at one end by the movement of the rackand will unwind at its other end, and mechanism cooper ting with saidother end.

This specification signed and witnessed this 15th day of May, 1916. I

V JOSEPH WOLFF. Witnesses:

IVM. VARIN, M. A. KERNEI.

Commissioner of Patents,

Washington, D. C.

